Gas cylinder



FIG. 1 is a front view of a gas cylinder in accordance with the design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a rear view thereof with a cover removed;

FIG. 6 is an enlarged top view thereof;

FIG. 7 is a front and left side perspective view thereof;

FIG. 8 is a front and right side perspective view thereof; and,

FIG. 9 is a rear and right side perspective view thereof.

The broken lines in FIG. 6 are included for the purpose of illustrating a portion of the gas cylinder that forms no part of the claimed design. 

The ornamental design for a gas cylinder, as shown and described. 